基于小行程的采煤机液压调高系统稳定性及动力学分析

Stability and Dynamic Analysis of Shearer with Hydraulic Height-adjusting System Based on Small Stroke

在建立采煤机液压调高系统传递函数及其动力学数学模型基础上,分析了调高油缸的行程大小对液压调高系统稳定性及动力学特性的影响。结果表明:油缸行程愈小,系统的相对稳定性愈好,同时随机载荷作用下调高油缸的振动幅值愈小。由于油缸行程受到油缸安装位置的约束,油缸行程太小时,滚筒将达不到最大采高的设计要求。因此,需选取最佳的油缸行程,使采煤机在满足最大采高和卧底量的设计要求下,液压调高系统具有较好的稳定性和动力学特性。

Based on the established transfer function and dynamic model of the shearer hydraulic height-adjusting system, the influence of the hydraulic cylinder stroke to the system ′ s stability and dynamic characteristics are analyzed. The results show that the smaller the cylinder stroke, the better of the system′ s relative stability and smaller vibration amplitude of the height-adjusting cylinder under the influence of random load. As the cylinder stroke is constrained by the position of the cylinder installation, if the cylinder stroke is too small, the drum will not reach the design requirements of maximum height. Therefore, under the design requirements of meet the maximum mining height and the underside volume, obtain the best cylinder stroke is very important to the hydraulic height-adjusting system′s stability and dynamic characteristics.